Mild traumatic brain injury induces prolonged visual processing deficits in children.

Primary Objective: To compare the sensitivity to simple and complex visual stimuli of children who have sustained a mild traumatic brain injury (mTBI) to that of matched non-injured children and to determine the evolution of visuo-perceptual performance over time.

Research Design: A prospective design was used to assess 18 children with mTBI and 18 matched healthy controls (8-16 years of age).

Methods And Procedures: Sensitivity to static and dynamic forms of simple (first-order) and complex (second-order) stimuli were assessed at 1, 4 and 12 weeks post-injury and at equivalent times for controls.

Infant sensitivity to radial optic flow fields during the first months of life.

Little is known about the development of the sensitivity for "optic flow," a large-scale pattern perceived during locomotion. The present study aimed to examine infants' coherence thresholds to radial optic flow motion during the first months of life. Using a forced-choice preferential looking technique, infants' sensitivities were measured with a moving radial stimulus varying in coherence on one side and a corresponding non-directional radial noise pattern on the other.

Maturation of the sensitivity for luminance and contrast modulated patterns during development of normal and pathological human children.

Any object may contain at least two spatio-temporal components referred to as first- and second-order, respectively, defined by spatial-temporal luminance modulation or by contrast, texture or depth modulation. This study investigates form sensitivity of infants, normals, premature or strabismic. A two-alternative forced-choice preferential looking procedure was used in monocular and binocular condition.